/*
This file is part of Ext JS 4.2

Copyright (c) 2011-2013 Sencha Inc

Contact:  http://www.sencha.com/contact

GNU General Public License Usage
This file may be used under the terms of the GNU General Public License version 3.0 as
published by the Free Software Foundation and appearing in the file LICENSE included in the
packaging of this file.

Please review the following information to ensure the GNU General Public License version 3.0
requirements will be met: http://www.gnu.org/copyleft/gpl.html.

If you are unsure which license is appropriate for your use, please contact the sales department
at http://www.sencha.com/contact.

Build date: 2013-03-11 22:33:40 (aed16176e68b5e8aa1433452b12805c0ad913836)
*/
/**
 * A utility class for exporting a {@link Ext.draw.Surface Surface} to a string
 * that may be saved or used for processing on the server.
 *
 * @singleton
 */
Ext.define('Ext.draw.engine.SvgExporter', function(){
   var commaRe = /,/g,
       fontRegex = /(-?\d*\.?\d*){1}(em|ex|px|in|cm|mm|pt|pc|%)\s('*.*'*)/,
       rgbColorRe = /rgb\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)/g,
       rgbaColorRe = /rgba\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*,([\d\.]+)\)/g,
       surface, len, width, height,

   init = function(s){
       surface = s;
       len = surface.length;
       width = surface.width;
       height = surface.height;
   },
   spriteProcessor = {
       path: function(sprite){

           var attr = sprite.attr,
               path = attr.path,
               pathString = '',
               props, p, pLen;

           if (Ext.isArray(path[0])) {
               pLen = path.length;
               for (p = 0; p < pLen; p++) {
                   pathString += path[p].join(' ');
               }
           } else if (Ext.isArray(path)) {
               pathString = path.join(' ');
           } else {
               pathString = path.replace(commaRe,' ');
           }

           props = toPropertyString({
               d: pathString,
               fill: attr.fill || 'none',
               stroke: attr.stroke,
               'fill-opacity': attr.opacity,
               'stroke-width': attr['stroke-width'],
               'stroke-opacity': attr['stroke-opacity'],
               "z-index": attr.zIndex,
               transform: sprite.matrix.toSvg()
           });

           return '<path ' + props + '/>';
       },
       text: function(sprite){

           // TODO
           // implement multi line support (@see Svg.js tuneText)

           var attr = sprite.attr,
               match = fontRegex.exec(attr.font),
               size = (match && match[1]) || "12",
               // default font family is Arial
               family = (match && match[3]) || 'Arial',
               text = attr.text,
               factor = (Ext.isFF3_0 || Ext.isFF3_5) ? 2 : 4,
               tspanString = '',
               props;

           sprite.getBBox();
           tspanString += '<tspan x="' + (attr.x || '') + '" dy="';
           tspanString += (size/factor)+'">';
           tspanString += Ext.htmlEncode(text) + '</tspan>';


           props = toPropertyString({
               x: attr.x,
               y: attr.y,
               'font-size': size,
               'font-family': family,
               'font-weight': attr['font-weight'],
               'text-anchor': attr['text-anchor'],
               // if no fill property is set it will be black
               fill: attr.fill || '#000',
               'fill-opacity': attr.opacity,
               transform: sprite.matrix.toSvg()
           });



           return '<text '+ props + '>' +  tspanString + '</text>';
       },
       rect: function(sprite){

           var attr = sprite.attr,
               props =  toPropertyString({
                   x: attr.x,
                   y: attr.y,
                   rx: attr.rx,
                   ry: attr.ry,
                   width: attr.width,
                   height: attr.height,
                   fill: attr.fill || 'none',
                   'fill-opacity': attr.opacity,
                   stroke: attr.stroke,
                   'stroke-opacity': attr['stroke-opacity'],
                   'stroke-width':attr['stroke-width'],
                   transform: sprite.matrix && sprite.matrix.toSvg()
               });

           return '<rect ' + props + '/>';
       },
       circle: function(sprite){

           var attr = sprite.attr,
               props = toPropertyString({
                   cx: attr.x,
                   cy: attr.y,
                   r: attr.radius,
                   fill: attr.translation.fill || attr.fill || 'none',
                   'fill-opacity': attr.opacity,
                   stroke: attr.stroke,
                   'stroke-opacity': attr['stroke-opacity'],
                   'stroke-width':attr['stroke-width'],
                   transform: sprite.matrix.toSvg()
               });

           return '<circle ' + props + ' />';
       },
       image: function(sprite){

           var attr = sprite.attr,
               props = toPropertyString({
                   x: attr.x - (attr.width/2 >> 0),
                   y: attr.y - (attr.height/2 >> 0),
                   width: attr.width,
                   height: attr.height,
                   'xlink:href': attr.src,
                   transform: sprite.matrix.toSvg()
               });

           return '<image ' + props + ' />';
       }
   },
   svgHeader = function(){
       var svg = '<?xml version="1.0" standalone="yes"?>';
       svg += '<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">';
       return svg;
   },
   svgContent = function(){
       var svg = '<svg width="'+width+'px" height="'+height+'px" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1">',
           defs = '', item, itemsLen, items, gradient,
           getSvgString, colorstops, stop,
           coll, keys, colls, k, kLen, key, collI, i, j, stopsLen, sortedItems, za, zb;

       items = surface.items.items;
       itemsLen = items.length;


       getSvgString = function(node){

           var childs = node.childNodes,
               childLength = childs.length,
               i = 0,
               attrLength,
               j,
               svgString = '', child, attr, tagName, attrItem;

               for(; i < childLength; i++){
                   child = childs[i];
                   attr = child.attributes;
                   tagName = child.tagName;

                   svgString += '<' +tagName;

                   for(j = 0, attrLength = attr.length; j < attrLength; j++){
                       attrItem = attr.item(j);
                       svgString += ' '+attrItem.name+'="'+attrItem.value+'"';
                   }

                   svgString += '>';

                   if(child.childNodes.length > 0){
                       svgString += getSvgString(child);
                   }

                   svgString += '</' + tagName + '>';

               }
           return svgString;
       };


       if(surface.getDefs){
           defs = getSvgString(surface.getDefs());
       }else{
           // IE
           coll = surface.gradientsColl;
           if (coll) {
               keys  = coll.keys;
               colls = coll.items;
               k     = 0;
               kLen  = keys.length;
           }

           for (; k < kLen; k++) {
               key   = keys[k];
               collI = colls[k];

               gradient = surface.gradientsColl.getByKey(key);
               defs += '<linearGradient id="' + key + '" x1="0" y1="0" x2="1" y2="1">';

               var color = gradient.colors.replace(rgbColorRe, 'rgb($1|$2|$3)');
               color = color.replace(rgbaColorRe, 'rgba($1|$2|$3|$4)')
               colorstops = color.split(',');
               for(i=0, stopsLen = colorstops.length; i < stopsLen; i++){
                   stop = colorstops[i].split(' ');
                   color = Ext.draw.Color.fromString(stop[1].replace(/\|/g,','));
                   defs += '<stop offset="'+stop[0]+'" stop-color="' + color.toString() + '" stop-opacity="1"></stop>';
               }
               defs += '</linearGradient>';
           }
       }

       svg += '<defs>' + defs + '</defs>';

       // thats the background rectangle
       svg += spriteProcessor.rect({
           attr: {
                   width: '100%',
                   height: '100%',
                   fill: '#fff',
                   stroke: 'none',
                   opacity: '0'
           }
       });

       // Sort the items (stable sort guaranteed)
       sortedItems = new Array(itemsLen);
       for(i = 0; i < itemsLen; i++){
           sortedItems[i] = i;
       }
       sortedItems.sort(function (a, b) {
           za = items[a].attr.zIndex || 0;
           zb = items[b].attr.zIndex || 0;
           if (za == zb) {
               return a - b;
           }
           return za - zb;
       });

       for(i = 0; i < itemsLen; i++){
           item = items[sortedItems[i]];
           if(!item.attr.hidden){
               svg += spriteProcessor[item.type](item);
           }
       }

       svg += '</svg>';

       return svg;
   },
   toPropertyString = function(obj){
       var propString = '',
           key;

       for(key in obj){

           if(obj.hasOwnProperty(key) && obj[key] != null){
               propString += key +'="'+ obj[key]+'" ';
           }

       }

       return propString;
   };

   return {
       singleton: true,

       /**
        * Exports the passed surface to a SVG string representation
        * @param {Ext.draw.Surface} surface The surface to export
        * @param {Object} [config] Any configuration for the export. Currently this is
        * unused but may provide more options in the future
        * @return {String} The SVG as a string
        */
       generate: function(surface, config){
           config = config || {};
           init(surface);
           return svgHeader() + svgContent();
       }
   };
});